Question

Me ajudem pfvr

Resolva as equações do 1°- grau:

Answer 1

LETRA (A)

$3x - 8 = x + 2$

$3x - x - 8 = 2$

$3x - x = 2 + 8$

$2x = 2 + 8$

$2x = 10$

$x = \frac{10}{2}$

$x = 5$

----------------------------

LETRA (B)

$8x + 10 = 15 + 3x$

$8x - 3x + 10 = 15$

$8x - 3x = 15 - 10$

$5x = 5$

$x = \frac{5}{5}$

$x = 1$

----------------------------

LETRA (C)

$x - 9 = - 2x - 21$

$x + 2x - 9 = - 21$

$x + 2x = - 21 + 9$

$3x = - 21 + 9$

$3x = - 12$

$x = \frac{- 12}{3}$

$x = - 4$

----------------------------

LETRA (D)

$- x + 17 = - 3x + 13$

$- x + 3x + 17 = 13$

$- x + 3x = 13 - 17$

$2x = 13 - 17$

$2x = - 4$

$x = \frac{- 4}{2}$

$x = - 2$